Processes for making silicone rubber moulds

Details Processes for making silicone rubber moulds Processes for making silicone rubber moulds

B - Operations, Transporting

29

D

18/1201

B29D 99/00 (2010.01)

Patent

CA 1040818

PROCESSES FOR MAKING SILICONE RUBBER MOULDS Abstract of the Disclosure The cost of a silicone rubber mould is reduced by making it partly from uncured, liquid, castable, silicone rubber and partly from compatible, reclaimed silicone rubber particles. The latter are treated, e.g., with a swelling agent, to decrease their specific gravity below that of the liquid, silicone rubber. When the two rubbers are amalgam- ated in a mould having an exposed surface of a master to be reproduced, the particles float away from the surface of the master leaving the liquid, silicone rubber, which is permitted to cure, in contact therewith. After curing the resultant silicone rubber mould is stripped from the master.

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